Sharp qt mp 5 w service manual

Page 1

QT-MPSW

SHARP SERVICE MANUAL

No. 80623QTMP5W//

PORTABLE CD STEREO SYSTEM

MODEL QT-MP5W

- In the Interests of user-safety the set should be restored to
its original condition and only parts identical to those
specified be used.

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NTENT
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CHAPTER 1. GENERAL DESCRIPTION CHAPTER 5. CIRCUIT SCHEMATICS AND PARTS
[1] Precaution For Using Lead-Free Solder ........ 1 LAYOUT
[2] Safety Precaution For Service Manual .......... 1 [1] Notes On Schematic Diagram
[3] Voltage Selection ..................................... [2] Types Of Transistor And LED ..

-1
»2
..1-2
[4] AC Power Supply Cord and AC Plug Adaptor.. 1-2 [3] Schematic Diagram
-3
-4

.4

[5] Specifications ................................................ [4] Wiring Side Of PWB ..
[6] Names Of Parts ............................................. 1

CHAPTER 6. FLOWCHART
CHAPTER 2. ADJUSTMENTS [1] Troubleshooting ............................................. 6-1
[1] Tuner Section ......................... 2-1
[2] Tape Deck Adjustments... ...... 2-2 CHAPTER 7. OTHERS

[1] Function Table Of IC .. ..... 7-1
CHAPTER 3_ DIAGRAMS [2] LCD Display ............... ...7~11
[1] Block Diagrams ............................................. 3-1

PARTS GUIDE

CHAPTER 4. CIRCUIT DESCRIPTION
[1] Waveforms Of CD Servo Circuit.... ...... 41
[2] Voltage ................................................ 4-2

\ j

Parts marked with A" are important for maintaining the safety of the set. Be sure to replace these parts with specified ones
for maintaining the safety and performance of the set.

This document has been published to be used

S HARP CORPO RATION for after sales service only.

The contents are subject to change without notice.

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QT-MP5W

CHAPTER 1. GENERAL DESCRIPTION

[1] Precautions For Using Lead-Free Solder

1. Employing lead-free solder

"AUDIO, CONTROL, RECTIFIER, SPEAKER, LED, CD, TUNER, TAPE, MCU PWB" of this model employs
lead»free solder.

The LF symbol indicates lead»free solder, and is attached on the PWB and service manuals.The alphabetical
character following LF shows the type of lead-free solder.

Example: E a

Sn-Ag-CU Indicates lead»free solder of tin,silver and copper.

2. Using lead-free wire solder
When fixing the PWB soldered with the lead-free solder, apply lead»free wire solder. Repairing with
conventional lead wire solder may cause damage or accident due to cracks.
As the melting point of lead-free solder (Sn-Ag»Cu) is higher than the lead wire solder by 40°C, were
commend you to use a dedicated soldring bit,if you are not familiar with how to obtain lead»free wire solder or
soldering bit,contact our service station or service branch in your area.

3.50ldering
As the melting point of lead-free solder (Sn-Ag»Cu) is about 220 °C which is higher than the conventional lead
solder by 40°C, and as it has poor solder wettability, you may be apt to keep the soldering bit in contact with the
PWB for extended period of time. However, since the land may be peeled off or the maximum heat»resistance
temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady
soldering condition.
Lead-free solder contains more tin, and the end of the soldering bit may be easily corrected. Make sure to turn 0|
and off the power of the bit as required.
If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder.Clean the bit afte
every use of it,
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.
Be careful when replacing parts with polarity indication on the PWB silk.

Lead-free wire solder for servicing

Rel No. Parts No. Description
PWB-A1 92LMP500280046 AUDIO
PWB-A2 92LMP500380047 CONTROL
PWB-A3 92LMP501280003 RECTIFIER
PWB-A4 92LMP502300000 SPEAKER
PWB-A5 LED
PWB-B 92LMP500980004 CD
PWB-C TU N ER
PWB-E 92LMP501380017 TAPE
PWB-F 92LMP502300000 MCU